88 lines
2.0 KiB
JavaScript
88 lines
2.0 KiB
JavaScript
// const nodes = [
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// {"id": "Alice"},
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// {"id": "Bob"},
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// {"id": "Carol"}
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// ];
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//
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// const links = [
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// {"source": 0, "target": 1}, // Alice → Bob
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// {"source": 1, "target": 0} // Bob → Carol
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// ];
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const graphEl = document.getElementById("graph");
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const drag = (simulation) => {
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function dragstarted(event, d) {
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if (!event.active) simulation.alphaTarget(0.3).restart();
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d.fx = d.x;
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d.fy = d.y;
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}
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function dragged(event, d) {
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d.fx = event.x;
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d.fy = event.y;
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}
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function dragended(event, d) {
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if (!event.active) simulation.alphaTarget(0);
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d.fx = null;
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d.fy = null;
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}
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return d3.drag()
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.on("start", dragstarted)
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.on("drag", dragged)
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.on("end", dragended);
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}
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const simulation = d3.forceSimulation(nodes)
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.force("link", d3.forceLink(links).id(d => d.id))
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.force("charge", d3.forceManyBody())
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.force("x", d3.forceX())
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.force("y", d3.forceY());
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setTimeout(() => {
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const width = graphEl.clientWidth;
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const height = graphEl.clientHeight;
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const svg = d3.create("svg")
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.attr("viewBox", [-width / 2, -height / 2, width, height]);
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const link = svg.append("g")
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.attr("stroke", "#999")
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.attr("stroke-opacity", 0.6)
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.selectAll("line")
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.data(links)
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.join("line")
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.attr("stroke-width", d => Math.sqrt(d.value));
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const node = svg.append("g")
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.attr("stroke", "#fff")
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.attr("stroke-width", 1.5)
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.selectAll("circle")
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.data(nodes)
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.join("circle")
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.attr("r", 5)
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.attr("fill", "red")
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.call(drag(simulation));
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node.append("title")
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.text(d => d.id);
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simulation.on("tick", () => {
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link
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.attr("x1", d => d.source.x)
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.attr("y1", d => d.source.y)
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.attr("x2", d => d.target.x)
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.attr("y2", d => d.target.y);
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node
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.attr("cx", d => d.x)
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.attr("cy", d => d.y);
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});
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graphEl.appendChild(svg.node());
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}, 0);
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